Ask OpenStack: Q&A Site for OpenStack Users and Developers - Individual question feedhttps://ask.openstack.org/en/questions/Questions and answers OpenStack CommunityenCopyright of the authors unless stated otherwiseMon, 05 Mar 2018 20:44:11 -0600change MTU value in neutronhttps://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/ Hi All,
I have RHOSP10 deployed with undercloud, overcloud in HA fashion using 3 controllers, 3 compute nodes, 3 Ceph Storage nodes. Everything just works fine. I have an use case to change the MTU value at the neutron level - for the OVS bridges so as to reflect the new MTU value for any new VM created). How to achieve this ? What will be the consequence which needs to be taken care ? Please suggest
Any sort of help is appreciated.
--RegardsFri, 19 Jan 2018 14:32:05 -0600https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/Answer by tahir696 for <p>Hi All,</p>
<p>I have RHOSP10 deployed with undercloud, overcloud in HA fashion using 3 controllers, 3 compute nodes, 3 Ceph Storage nodes. Everything just works fine. I have an use case to change the MTU value at the neutron level - for the OVS bridges so as to reflect the new MTU value for any new VM created). How to achieve this ? What will be the consequence which needs to be taken care ? Please suggest</p>
<p>Any sort of help is appreciated.</p>
<p>--Regards</p>
https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/?answer=112104#post-id-112104to Update the MTU size you also need to reconfigure the switches for the larger MTU size that could be 9000.Wed, 24 Jan 2018 00:17:22 -0600https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/?answer=112104#post-id-112104Answer by CloudEnthusiast for <p>Hi All,</p>
<p>I have RHOSP10 deployed with undercloud, overcloud in HA fashion using 3 controllers, 3 compute nodes, 3 Ceph Storage nodes. Everything just works fine. I have an use case to change the MTU value at the neutron level - for the OVS bridges so as to reflect the new MTU value for any new VM created). How to achieve this ? What will be the consequence which needs to be taken care ? Please suggest</p>
<p>Any sort of help is appreciated.</p>
<p>--Regards</p>
https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/?answer=112087#post-id-112087Hi All,
Let me put here a workaround what i worked in my case.
On all 3 overcloud-controller nodes, i changed the parameter
global_physnet_mtu=<NEW-MTU-VALUE>
value in /etc/neutron/neutron.conf. Later i restarted neutron server as below:
systemctl restart neutron-server.service
With this, the all exisiting neutron networks got the new MTU also the newly created networks were with new MTU.
--RegardsMon, 22 Jan 2018 20:27:26 -0600https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/?answer=112087#post-id-112087Comment by CloudEnthusiast for <p>Hi All,
Let me put here a workaround what i worked in my case.
On all 3 overcloud-controller nodes, i changed the parameter</p>
<pre><code>global_physnet_mtu=&lt;NEW-MTU-VALUE&gt;
</code></pre>
<p>value in /etc/neutron/neutron.conf. Later i restarted neutron server as below:</p>
<pre><code>systemctl restart neutron-server.service
</code></pre>
<p>With this, the all exisiting neutron networks got the new MTU also the newly created networks were with new MTU.</p>
<p>--Regards</p>
https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/?comment=112964#post-id-112964At the switch end , the network admin has enabled jumbo frames already.Mon, 05 Mar 2018 20:44:11 -0600https://ask.openstack.org/en/question/112041/change-mtu-value-in-neutron/?comment=112964#post-id-112964